Reflections now have a speed modelling challenge every week, below are some of my entries this month:
Bone crossbow, 3 hours modelling, 1 hour texturing and rendering in Marmoset
Lucky Bamboo, 1 hour modelling, 30mins texturing, 20 mins rendering
Chess piece - Knight. 1 hour modelling, no textures / rendering.
These were done as quick exercises without much attention to detail - there are many things I know I could do better if I had a longer time limit. Might make a high poly of that crossbow - I think it's from a movie but I don't know which, I just copied a cool reference!